Precision measurements of B(D+ -> mu(+)nu(mu)), the pseudoscalar decay constant fD+, and the quark mixing matrix element vertical bar V-cd vertical bar

  • Ablikim, M.
  • Achasov, M. N.
  • Ai, X. C.
  • Albayrak, O.
  • Ambrose, D. J.
  • An, F. F.
  • An, Q.
  • Bai, J. Z.
  • Ferroli, R. Baldini
  • Ban, Y.
  • Bennett, J. V.
  • Bertani, M.
  • Bian, J. M.
  • Boger, E.
  • Bondarenko, O.
  • Boyko, I.
  • Braun, S.
  • Briere, R. A.
  • Cai, H.
  • Cai, X.
  • Cakir, O.
  • Calcaterra, A.
  • Cao, G. F.
  • Cetin, S. A.
  • Chang, J. F.
  • Chelkov, G.
  • Chen, G.
  • Chen, H. S.
  • Chen, J. C.
  • Chen, M. L.
  • Chen, S. J.
  • Chen, X.
  • Chen, X. R.
  • Chen, Y. B.
  • Cheng, H. P.
  • Chu, X. K.
  • Chu, Y. P.
  • Cronin-Hennessy, D.
  • Dai, H. L.
  • Dai, J. P.
  • Dedovich, D.
  • Deng, Z. Y.
  • Denig, A.
  • Denysenko, I.
  • Destefanis, M.
  • Kalantar-Nayestanaki, N.
  • Kavatsyuk, M.
  • Loehner, H.
  • Messchendorp, J. G.
  • Moeini, H.
Publication date
March 2014

Abstract

We report a measurement of the branching fraction B(D+ -&gt; mu(+)nu(mu)) = [3.71 +/- 0.19(stat) +/- 0.06(sys)] x 10(-4) based on 2.92 fb(-1) of data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar determined from a global Standard Model fit, implies a value for the weak decay constant f(D+) = (203.2 +/- 5.3 +/- 1.8) MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for f(D+), we find vertical bar V-cd vertical bar 0.2210 +/- 0.0058 +/- 0.0047. In either case, these are the most precise results for these quantities to date.</p

Extracted data

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